diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst
index b231fa568cf342..a527d6746b5d07 100644
--- a/Doc/library/codecs.rst
+++ b/Doc/library/codecs.rst
@@ -265,6 +265,20 @@ wider range of codecs when working with binary files:
    :func:`iterencode`.
 
 
+.. function:: readbuffer_encode(buffer, errors=None, /)
+
+   Return a :class:`tuple` containing the raw bytes of *buffer*, a
+   :ref:`buffer-compatible object <bufferobjects>` or :class:`str`
+   (encoded to UTF-8 before processing), and their length in bytes.
+
+   The *errors* argument is ignored.
+
+   .. code-block:: pycon
+
+      >>> codecs.readbuffer_encode(b"Zito")
+      (b'Zito', 4)
+
+
 The module also provides the following constants which are useful for reading
 and writing to platform dependent files: